修改mysql数据库的休眠时间

1.查看当前休眠时间（默认为八个小时，单位是秒）

mysql> show global variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout  | 28800 |
+---------------+-------+
1 row in set (0.01 sec)

mysql> show session variables like 'wait_timeout';
+---------------+-------+
| Variable_name | Value |
+---------------+-------+
| wait_timeout  | 28800 |
+---------------+-------+
1 row in set (0.00 sec)

2.修改休眠时间（一个小时）

mysql> set global wait_timeout = 3600;
Query OK, 0 rows affected (0.00 sec)

mysql> set session wait_timeout = 3600;
Query OK, 0 rows affected (0.00 sec)